Ecraseur



(No Model.)

F. J. MBSLE,

BGRASBUR.

Patented Feb. 11,

Enh.

.\ will u NITED STATES ATENT Orricn.

FRANCIS J. MESLE, OF CHICAGO, ILLINOIS.

ECRASEU R.

SPECIFICATION forming part of ALetters Patent No. 421,082, dated February 11, 1890.

Application led November 26, 1889. Serial No. 331,611. (No modell) To all whom it may concern:

Be it known that I, FRANCIS J. MEsLE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Ecraseurs, of which the following is a speciiication.

My invention relates to an improvement in ecraseurs generally, though intended more especially for use with such instruments in the practice of veterinary surgery.

The object of my invention is to provide an ecraseur in the use of which the surgical operation ma'y be performed much more quickly, and therefore more safely and easily, than with the implements of a similar nature hitherto employed; and my invention consists in the general construction as well as in the details of construction hereinafter set forth and claimed.

In the drawings, Figure l is a view in elevation of an ecraseur embodying my improvement; Fig'. 2, an enlarged broken sectional view taken on the line 2 2 of Fig. 1, looking in the direction of the arrows, the clampingnut, however, being shown partly in elevation and in the condition of engaging the screw-thread of the rod; Figz, a portion of the device substantially as illustrated in Fig. 2, but showing the clamping-nut altogether in elevation and out of engagement with the screw-threaded rod; Fig. 4, an end view of a detail; Fig. 5,'another detail in side elevation, and Figs. Gand 7 broken and partly sectional views showin g a modifiedconstruction.

In the device shown in Figs. 1, 2, and 3, A represents a guide-tube having a solid end portion A', andprovided with a slot t, extending throughout its hollow portion. Within the tube A is a rod B, of greater length than the hollow portion and of a diameter sufficiently less than the inner periphery of the tube to enable it to be readily reciprocated within the latter. Upon the rod B toward the-end thereof which extends beyond the tube is a rigid handle B', and for a limited extent toward its opposite end the rod is reduced in diameter, as shown at s, which reduced portion is provided toward the extremity with a screw-thread s.

The fiat severing-chain C, of a construction hitherto common in ecraseurs, extends through a head r, affordinga guide at the end of the solid portion of the tube, and its ends, which are shaped to afford knobs q, resty in sockets q of a block D, the knobs being held down bya swinging plate or:escutcheon q2, fastened to the block by a set-screw g3. The block D is provided on its under side with a reduced portion or neck p, which extends through and iits snugly but loosely in the slot t, and with a sleeve p', which loosely surrounds the part s of the rod B between the screw-thread s and shoulder s2, which latter is produced` in the formation of the reduced portion. A nut 33 on the screw-thread s operates to hold the sleeve upon the rod and loosely against the shoulder s2.

Extending the full length of the rod B between the shoulder S2 and handle B is a (preferably, for the sake of quickness) triple screw-thread 0. A A is a washer In., which operates to contract the opening, and which iits snugly but loosely over the threaded rod B toallow the latter to be slid readily through it.

E is a sleeve having an enlarged portion m and reduced portion or shank Z, screwthreaded toward its end, as shown at Z. At the junction of the parts m and Z of the sleeve an inner shoulder m and an outer shoulder m2 are produced, and at the extremity of the end portion Z of the shank is an inward-extending iiange or stop Z2. On opposite sides of the sleeve, E, and extending through the latter from the screw-threaded part Z to the inner shoulder m', are slots lo.

F is Yan expansible and contractible clamping-nut, comprising a sleeve or collar portion i and normally outward-Haring spring-arms i', provided with heads t2, having concave inner faces formed with triple screw-threads to fit the screw-threads of the rod B.. The clamping-nut rests with its collar portion, which is capable of ,sliding loosely over the rod B, within the shank Z, and its spring-arms extend through the openings k to cause the outer faces of its heads 2 to project normally beyond the outer surface of the shank..

G is a'shell or ferrule of Haring shape, as

shown, tofit loosely around the rod B at one i.

At the open end of the tube IOO end and overlap at its other end the adjacent end of the part m of the sleeve E. `The shell G is provided with an internal screw-thread,

as shown at h, to iit the thread of the part Z', and toward its flaring end it is formed with internal cam-faces g, which, when the shell is turned in one direction, bear against the heads ot` the spring clamping-nut F, causing their threads to engage the threads of the rod B, and which, when the shell is turned in the opposite direction, allow the heads by the resilience ot the spring-arms t" to disengage the rod. A pin x on the surface of the tube A anda bayonet-socket in the part m of the sleeve E enable those parts to be firmly but removably secured together, and the engagement of the thread h with that on the part l holds the shell G and sleeve E together.

In operation the shell G is irst given a halt-turn to the left to release the engagement of the clamping-nut with the threaded rod, thereby to enable the latter to be pushed into the tube without turning, to cause the looped chainl C to extend its full capacity beyondV the guide r. The loop is then placed around the part to be severed and the rod drawn by means of the handle B out of the tube far enough to contract the loop tightly around the part. The shell G is then given a half-turn to the right to bring about engagement of the clamping nut with the threads of the rod, when the surgical operation is performed in the usual way by turning the handle B to draw in the loop.

In the construction above described the looped chain is distended and withdrawn by the reciprocation of the rod B,which in operation therefore causes a corresponding lengthening and shortening of the instrument. This feature, while considered immaterial or even desirable by some users, is by others thought to be undesirable, and therefore to supply an ecraseur to those who may desire it wherein the rod shall be nonueciprocating and which shall at the same time contain my improvements I provide the construction shown in Figs. G and 7. In this device the tube A has two slots t, the second slot extendingalong the under side, and at its open end it is provided with a perforated screwcap The rod l5 is provided with a rigid collar e, of larger diameter than the inner periphery of the tube A, which extends between the end of the tube and cap, and which, when the rod is turned, will rotate in the cap and prevent reciprocation of the rod. The block D is upon the sleeve E, which latter is formed, as shown, without the reduced parts l l. Instead of those parts, it has on its inner periphery rigid lugs (l (Z, which extend through to slide in the slots t, and which carry a sleeve CZ', extending within the tube to surround loosely the threaded red B, and having longitudinal slots d?, corresponding in position with the slots t. The clamping-nut F is of substantially the same construction as that before described, its collar t, however, being oi' slightly-larger diameter to lit tightly around the sleeve d against the lugs d. The clamping-nut is thus caused to extend in the contrary direction to that of the other device, and its spring-borne heads i2 are arranged to play through the slots t and d2. The ferrule G, which, as shown, may be much shorter than that of the other device, tits at one end snugly but loosely around the tube A to slide over the latter, and at its opposite end it overlaps the edge ot' the sleeve. Around this overlapping end the ferrule is provided with a peripheral groove l, into which a Iinger b', forming an integral part of the block D, extends, and thus operates to maintain the ferrule and sleeve together, while permitting to the 'former independent rotation. On the inner periphery of the ferrule are cam-faces g, which are out of contact with the tube, but bear against the projecting heads of the clamping-nut. As in the other construction, a half-turn of the ferrule alternately in eontrary directions causes the cams to produce engagement and disengagement of the elamp ing-nut and threaded rod.

In the use of the modified construction, the clamping-nut being disengaged from the rod, the ferrule G and sleeve E, with. the clamping-nut, may be slid along the tube to expand or contract the loop of the chain, while, when by a half-turn of the ferrule, as describedthe nut is caused to engage the threaded rod, further contract-ion of the loop is eiected by turning the rod by means of its handle lS, and thus causing the il'errule, sleeve, block, and nut to travel along the rod and tube.

Wfhat I claim as new, and desire to secure by Letters Patent, isp l. In an ecraseur,the combination, with a slotted tube having a guide r at one end, threaded rod within the tube provided with a handle, sliding block upon the tube, and looped severing-chain secured at its ends to the sliding block, of an expansible or eontractible clampingnut for the threaded rod and a ferrule G, engaging the said clampingnut and operated by turning to produce en^ gagement and disengagement oi the clamping-nut and rod, substantially as and for the purpose set forth. v

2. vIn an ecraseur, the combination, with a slotted tube having a guide r at one end, threaded rod within the tube provided with a handle, sliding block upon the tube, and looped severing-chain secured at its ends to the sliding block, of a non-rotary sleeve E upon the tube, having a slotted reduced portion, an expansible and eontractible nut F for the threaded rod supported by the sleeve, and comprising a collar i, springarms fi', and threaded heads t2, extending through the slotted sleeve, and a rotary ferrule G about the sleeve, engaging the heads of the clampingnut and operated by turning to produce engagement and disengagement of the clamping-nut and rod, substantially as and for the purpose set forth.

3. In an ecraseur, the combination of atube provided with slots t in dil''erent sides and a guide i' at one end, threaded rod 1-3 within the IOC) IIO

tube, provided With a handle, sliding block D upon the tube, looped severing-chain C, eX- tending through the guide' 1' and secured at its ends to the sliding block, and clamping means, substantially as described, extending through the slots t for producing engagement and disengagement of the sliding block With the threaded rod, substantially as and for lthe purpose set forth.

4. In an ecraseur, the combination of atube provided with slots t in different sides and a guide 7' at one end, threaded rod B Within the tube, provided with a handle, sliding sleeve E upon the tube, blockD upon the sleeve, looped severingohain C, extending through the guide FRANCIS JA MESLE.

In presence of- J. W. DYRENFORTH, T. L. MAY. 

